GASOLINE LAMPS AXD GASOLINE GAS MACHINES 37 



especially adapted to the lighting of tents and temporary 

 buildings for public meetings. 



GASOLINE GAS MACHINES 



44. Gasoline Easily Vaporizes. We have seen that gasoline 

 exposed to the air vaporizes rapidly. We have also seen that 

 if any considerable quantity of gasoline remains exposed to the 

 air of a room for a short time that the air becomes so charged 

 with the vapor of gasoline that it burns readily. In fact, the 

 mixture frequently explodes violently when a flame is brought 

 near. This is the cause of most accidents which occur from 

 the careless use of gasoline. 



Since, in the lamp, the gasoline is exposed to the air for an 

 instant only it is necessary to heaf it so as to completely vapor- 

 ize it before mixing with the air. The heat produces complete 

 vaporization, as we might suppose from the second law of 

 evaporation (Art. 13). In the gasoline machine the gasoline 

 is exposed to the air for a sufficient time so that all of the gasoline 

 is vaporized without the use of artificial heat. 



45. Gasoline Gas Machines. There are many different 

 types of gasoline gas machines. Every machine must, how- 

 ever, consist of two distinct and different parts and usually 

 possesses a third. The essential parts are a BLOWER or PUMP, 

 and a CARBURETER. The third part is called a MIXER. 



THE BLOWER is simply a device for forcing a current of air 

 out through the carbureter and back into the pipes of the 

 building. It maintains the pressure on the gas. Fig. 19 

 shows a common form of blower. It consists of a large fan 

 operated by means of.a heavy weight. The weight is wound 

 up at intervals as required. It exerts a constant pressure upon 

 the pump. As long as lights are burning, the pressure is being 

 reduced and the pump works to maintain the pressure. 



THE CARBURETER is a large tank capable of holding several 

 barrels of gasoline. It is buried in the ground usually some 

 distance from the wall of the basement of the building. 

 There are, of course, different styles of carbureters. The 



